So, Who's Being The Real B*****?

Lady Gaga Makes Sweet Peace Offering, Kelly Osbourne Not-So-Thrilled

By Sarah Flanigan14 hours agoomg!

Kelly Osbourne may have asked for a drama-free birthday when she celebrated her 29th on Sunday, but it doesn't look like she got it. It seems Lady Gaga felt such an occasion might be time to bury the hatchet with the Osbourne clan.

On Kelly's special night, Mother Monster met with her mom, Sharon Osbourne, on the U.K. set of "The X Factor," where Sharon is a judge and Gaga was performing. The "Born This Way" singer brought along a sweet olive branch for "The Talk" co-host to bring back for her daughter: a birthday cake. Kelly wasn't so impressed by the gesture.

"Not to be ungrateful but why would you send me a birthday cake via my MOTHER in a country half the [world] away? #JustSendItToME #LoveNotWar," she tweeted. Kelly also Instagrammed a picture of the cake alongside the caption, "#EatMyS**t #Hypocrisy."

Gaga replied to Kelly's tweet with a picture of herself and Sharon holding the cake noting, "@KellyOsbourne I didn't know it was your B-day until this afternoon. Meant as a peace offering. Happy Birthday."

Kelly then went on a rant on Twitter, posting a slew of Gaga-inspired tweets writing, "#StefaniStopIt!," "I live for a #Cause not for the #Applause!!!!!!!," and "'Let them eat cake' #MarieAntoinette."

So why would Lady Gaga need to send a peace offering in the first place? Well, the two have been feuding for years, starting with Kelly telling the U.K. Mirror in 2009, "I love Lady Gaga's tracks but I just wish she'd keep her mouth shut. She talks way too much and has too much attitude. It's starting to make me go off her."

They got into another public argument earlier this year when Kelly told Fabulous magazine that Gaga's fans were bullying her about her weight and telling her to go kill herself. Gaga then fought back to Kelly's bullying claim in an open letter on her website, calling her out for her role on "Fashion Police" and how she criticizes people's appearance on the E! show.

Check out this video to hear more about the drama between these two, and tune in to "omg! Insider" on television tonight for the latest in entertainment news!